997 research outputs found
Collective clusterization effects in light heavy ion reactions
The collective clusterization process, proposed for intermediate mass
fragments (IMFs, 4A28, 2Z14) emitted from the hot and rotating
compound nuclei formed in low energy reactions, is extended further to include
also the emission of light particles (LPs, A4, Z2) from the
fusion-evaporation residues. Both the LPs and IMFs are treated as the dynamical
collective mass motion of preformed clusters through the barrier. Compared to
IMFs, LPs are shown to have different characteristics, and the predictions of
our, so-called, dynamical cluster-decay model are similar to those of the
statistical fission model.Comment: 4 pages, 3 figures, Conferenc
Cluster-decay of hot Ni formed in S+Mg reaction
The decay of , formed in reaction at the incident
energies =51.6 and 60.5 MeV, is calculated as a cluster decay process
within the Preformed Cluster-decay Model (PCM) of Gupta et al. re-formulated
for hot compound systems. The observed deformed shapes of the exit channel
fragments are simulated by introducing the neck-length parameter at the
scission configuration, which nearly coincides the saddle
configuration. This is the only parameter of the model, which though is also
defined in terms of the binding energy of the hot compound system and the
ground-state binding energies of the various emitted fragments. The calculated
s-wave cross sections for nuclear shapes with outgoing fragments separated
within nuclear proximity limit (here 0.3 fm) can be compared with the
experimental data, and the TKEs are found to be in reasonably good agreement
with experiments for the angular momentum effects added in the sticking limit
for the moment of inertia. Also, some light particle production (other than the
statistical evaporation residue, not treated here) is predicted at these
energies and, interestingly, , which belongs to evaporation residue, is
found missing as a dynamical cluster-decay fragment.Comment: 13 Pages, 12 figure
Programming models for sensor networks: a survey
Sensor networks have a significant potential in diverse applications some of which are already beginning to be deployed in areas such as environmental monitoring. As the application logic becomes more complex, programming difficulties are becoming a barrier to adoption of these networks. The difficulty in programming sensor networks is not only due to their inherently distributed nature but also the need for mechanisms to address their harsh operating conditions such as unreliable communications, faulty nodes, and extremely constrained resources. Researchers have proposed different programming models to overcome these difficulties with the ultimate goal of making programming easy while making full use of available resources. In this article, we first explore the requirements for programming models for sensor networks. Then we present a taxonomy of the programming models, classified according to the level of abstractions they provide. We present an evaluation of various programming models for their responsiveness to the requirements. Our results point to promising efforts in the area and a discussion of the future directions of research in this area.
Shell closure effects studied via cluster decay in heavy nuclei
The effects of shell closure in nuclei via the cluster decay is studied. In
this context, we have made use of the Preformed Cluster Model () of Gupta
and collaborators based on the Quantum Mechanical Fragmentation Theory. The key
point in the cluster radioactivity is that it involves the interplay of close
shell effects of parent and daughter. Small half life for a parent indicates
shell stabilized daughter and long half life indicates the stability of the
parent against the decay. In the cluster decay of trans lead nuclei observed so
far, the end product is doubly magic lead or its neighbors. With this in our
mind we have extended the idea of cluster radioactivity. We investigated decay
of different nuclei where Zirconium is always taken as a daughter nucleus,
which is very well known deformed nucleus. The branching ratio of cluster decay
and -decay is also studied for various nuclei, leading to magic or
almost doubly magic daughter nuclei. The calculated cluster decay half-life are
in well agreement with the observed data. First time a possibility of cluster
decay in nucleus is predicted
Binarized Convolutional Neural Networks with Separable Filters for Efficient Hardware Acceleration
State-of-the-art convolutional neural networks are enormously costly in both
compute and memory, demanding massively parallel GPUs for execution. Such
networks strain the computational capabilities and energy available to embedded
and mobile processing platforms, restricting their use in many important
applications. In this paper, we push the boundaries of hardware-effective CNN
design by proposing BCNN with Separable Filters (BCNNw/SF), which applies
Singular Value Decomposition (SVD) on BCNN kernels to further reduce
computational and storage complexity. To enable its implementation, we provide
a closed form of the gradient over SVD to calculate the exact gradient with
respect to every binarized weight in backward propagation. We verify BCNNw/SF
on the MNIST, CIFAR-10, and SVHN datasets, and implement an accelerator for
CIFAR-10 on FPGA hardware. Our BCNNw/SF accelerator realizes memory savings of
17% and execution time reduction of 31.3% compared to BCNN with only minor
accuracy sacrifices.Comment: 9 pages, 6 figures, accepted for Embedded Vision Workshop (CVPRW
Analgesic and anti-inflammatory activity of hydroalcoholic extract of Piper betle leaves in experimental animals
Background: Piper betle leaf, commonly known as ‘paan’ has long been known for its various medicinal properties in traditional medicine but certain properties have remained less explored. We tried to assess the analgesic and anti-inflammatory activities of Piper betle leaves.Methods: Hydroalcoholic extract of Piper betle leaves (HEPBL) was extracted using soxhlet apparatus and its phytochemical analysis was performed. Wistar rats and Albino mice were used for all the experiments. Acute toxicity study was also done according to OECD guideline no.425 and the test doses were decided accordingly. The experimental models of tail-flick method and acetic acid induced writhing were used to study the analgesic activity whereas carrageenan induced paw edema and cotton pellet granuloma models were used for anti-inflammatory action. Statistical analysis was performed using one-way analysis of variance (ANOVA) followed by Dunnett's test.Results: HEPBL showed significant analgesic activity at the doses of 100 mg/kg and 200 mg/kg, and showed significant anti-inflammatory activity at the doses of 50 mg/kg, 100 mg/kg and 200 mg/kg. The sub-therapeutic dose of HEPBL at 50 mg/kg also potentiated the analgesic effect of sub-therapeutic doses of standard analgesics. The analgesic and anti-inflammatory activity of P.betle may be attributed to the presence of various phyto constituents’ viz. flavonoids, tannins, phenols and glycosides.Conclusions: HEPBL has significant analgesic and anti-inflammatory activity in experimental animals in our study
Dynamical cluster-decay model for hot and rotating light-mass nuclear systems, applied to low-energy S + Mg Ni reaction
The dynamical cluster-decay model (DCM) is developed further for the decay of
hot and rotating compound nuclei (CN) formed in light heavy-ion reactions. The
model is worked out in terms of only one parameter, namely the neck-length
parameter, which is related to the total kinetic energy TKE(T) or effective
Q-value at temperature T of the hot CN, defined in terms of the
both the light-particles (LP), with 4, Z 2, as well as the
complex intermediate mass fragments (IMF), with , is
considered as the dynamical collective mass motion of preformed clusters
through the barrier. Within the same dynamical model treatment, the LPs are
shown to have different characteristics as compared to the IMFs. The systematic
variation of the LP emission cross section , and IMF emission
cross section , calculated on the present DCM match exactly the
statistical fission model predictions. It is for the first time that a
non-statistical dynamical description is developed for the emission of
light-particles from the hot and rotating CN. The model is applied to the decay
of Ni formed in the S + Mg reaction at two incident
energies E = 51.6 and 60.5 MeV. Both the IMFs and average
spectra are found to compare reasonably nicely with the experimental data,
favoring asymmetric mass distributions. The LPs emission cross section is shown
to depend strongly on the type of emitted particles and their multiplicities
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